Cylinder casting for steam engines



Aug. 9, 1927.

J. KUPKA CYLINDER CASTING FOR STEAM ENGINES 2 Sheets-Sheet 1 Filed Dec. 9. 1926' 147 7 ORA E J '2 Sheets-Sheet 2 .9 1927. Aug I J. KUPKA CYLINDER CASTING FOR STEAM ENGINES Filed Dec. 9. 1926 Patented Aug. 9, 1927.

'JoHANN KUPKA, or LONDON, nncmnfi.

CYLINDER CAS'.11I1\TG FOR STEAM ENGINES.

Application filed December 9, 1926. Serial No. 153,573.

a This invention relates to improvements in the cylinder castings, valve chests and boiler saddles of steam engines, more particularly locomotive steam engines, of the kind provided with double beat balanced poppet v valves, and in the arrangement of the steam sup ly and exhaust conduits provided in association therewith.

According to this invention the cylinder has cast integrally therewith a valve chest, a laterally extending flange whereby the cylinder can be mounted on a suitable underframe, and a saddle portion forming a seating on which a boiler can besupported. Separate exhaust passages are provided leading from the exhaust valves at each end of the cylinder, these passages bein arranged in such a manner that the exhaust steam is conducted along a path conforming to the stream line principle, and the steam supply passages in the casting are kept as short as possible by employing separate live steam connections to each end of the cylinder. In combination with this arrangement the valve chests are constructed to support removable valve seat cages designed in such a manner that the flow of steam cannot exert any active lateral pressure on the valve itself and thus bending stresses on the valve spindle are obviated.

Moreover the castings are constructed with seats upon which a chamber contalning valve operatlng cams are mounted in such a position that the valve stem can extend out of I section, of Figure 1.

the valve chest into these chambers to be actuated by the cam contained therein.

In the accompanying drawings V Figure 1 is an 'end view partly in section, of a pair of cylinders and appurtenant parts arranged in accordance with this invention. Figure 2 is .a side view of one of the said cylinders.

Figure 3 is a. half plan view, partly in Figure 4 is a detail sectional view after referred to.

As shown in thls drawing, the cylinders 1,

2 are cast integrally with valve chests 3 suitable for the reception of double beat poppet valves. These chests are divided to provide steam admission chambers: 4 and exhaust chambers 5 having valve seats formed on the walls thereof, or these walls may be arranged to sup ort valve cages 6 having seats thereon for ouble beat poppet valves 7.

herein- The valve stems extend out through the walls of the valve chests into operating cam chambers 8'bolted on .seatings 9 provided therefor on the respective cylinders. The valve cage or the corresponding part of the valve chest wall on the inlet or pressure side thereof is provided with a recess 10 within which the valve seat 11 is formed so as to protect the edge of the valve when the latter is at a short distance from its seat, both in its opening and closing movements, from the effects of, the flow of steam impinging against the edge of the valve.

Separate steam. inlet conduits 12 which may be flanged or otherwise formed to provide means for coupling a steam supply pipe thereto, are provided one at each end of the cylinder. Each vend of the cylinder is also provided with a corresponding exhaust conduit orpassage 13, the steam admission and steam exhaust valves arranged as above mentioned in separate compartments controlling the flow through these said conduitsor passages/The exhaust passages 13 are formed in laterally extending parts of the casting with the main parts thereof arranged obliquely to the vertical planes through the cylinder axis so that the outlet end of the passages can be brought to a convenient position below the smoke box of the engine, the said passages being arranged with easy curves at the bends so that they have a stream line configuration. The outlets 14 from these passages open through a curved boiler saddle or seatings 15 cast integrally with the walls of the passages 13. The cylinder is also provided with laterally extending flanges 16 connected with the ex-' haust passages and boiler seatings bywebs. These laterally extending flanges-are provided with facings. by which the cylinders on opposite sides of the engine can be bolted together and with facings 17 wherebythe castings can be mounted on and bolted to the longitudinal underframe members of the 100 plated care is taken to eliminate expansion 105 stresses in the feasting. This is provided for by keeping the live steam passages as short as possible. By casting the valve chest inte' 1 grally with the cylinder the clearance vol-' ume can be kept low m a manner especially.

suitable for-*valve motions in which the exhaust events are independent of ,the steam admission events.

I claim.

1. A cylinder casting for. a steam engine comprising in a unitary structure a cylinder supporting saddle, and poppet valve seats in the said valve chests, formed within recesses therein.

4. A cylinder casting for a steam engine comprising ina unitary structure a cylinder portion, valve chests at each end of the cylinder arranged to support poppet valve seats and a boiler supporting saddle, in combination with a separate valve operating cam chamber. 1 r

5. A steam engine cylinder having cast integrally therewith valve chests and a boiler supporting saddle, in combination with a separate valve operating cam chamber attached to the cylinder, poppet valves arranged vwithin the valve chests, and stems carryingthe said valves and extending out of the valve chests into the said cam chamber.

6. A'steam engine cylinder having cast integrally therewith valve chests and a boiler supporting saddle, in combination with a separate valve operating cam chamber at-- tached to the cylinder, poppet valves arranged within the valve chests, and stems arranged parallel to the cylinder axis.

7. In a steam engine a unitary structure 4 supply pipes opening into the respective admission valve chambers, a boiler supporting saddle, and exhaust passages leading from the respective exhaust valve chambers to apertures provided in the said saddle, the said exhaust passagesextending in a dlI'GC-z tion oblique to the vertical the axis of the cylinder.

8. In a steam engine, a unitary structure comprising a cylinder portion, admission valve chambers one at each end of the cylinder portion and arranged to supportpops pet valve seats, exhaust valve chambers one at each end of the cylinder portion and arranged to support poppet valve seats, a boiler supporting saddle, exhaust passages extend ing obliquely to the vertical plane through the cylinder axis from the exhaust valve chambers to apertures in the said saddle, in combination with a separate valve operating cam chamber mounted on the said cylinder.

JIOHANN KUPKA.

plane through 

